Calculating Ball Speed in a bearing

[martinhw]

I am looking to find the ball speed within a ball bearing.

The bearing is a Radial Ball Bearing 14" x 14.625" x 0.3125"

There are 143 balls in the bearing separated by a snap-over cage. The ball diameter is 0.156" nominal.

Lets assume for the calculation that there is no lubrication.

The question is:
If the bearing shaft is rotating at 1rpm, what is the ball speed?

 

[electricpete]

http://books.google.com/books?id=yN...p6H3AQ&sa=X&oi=book_result&ct=result&resnum=2

These equations assume no slipping. Some quantities of interest:

"Rolling Element" = Rolling Element Spin Frequency. What is the frequency at which a rolling element spins about its own axis.

"Cage FrequencY" = How fast does the cage (and every rolling elmenet) orbit around the bearing centerline.

It's not clear what you meant by "speed".

These assume outer ring stationary and inner ring rotating, I believe.



=====================================
Eng-tips forums: The best place on the web for engineering discussions.

 

[martinhw]

Hi electricpete,

Thank you for your reply.

I am looking to calculate the number of revolutions the rolling element completes in one cycle of the bearing inner ring.

The inner ring is spinning and the outer ring is static.

From the link above, I should be able to calculate what I need.

Many Thanks.

 

[dinjin]

I think it would simply be the mean raceway diameter divided by the ball diameter time the rpm.

 

[sreid]

dinjin,

And I think +1 [epicyclic gearing].